Mercury - Exhaust Elbow Gasket 496 Magnum & 8.1S Series Composite Marine Gasket 862356. OverviewWhen you run a big-block MerCruiser, you get used to the deep, confident rumble that tells you everything is working the way it should. And when something as simple as an exhaust gasket starts to fail, you can feel it in the tone of the engine long before you see it on a gauge. That's why parts like this matter. The exhaust elbow gasket may not be a flashy component, but it's one of those small, essen